Vacuum-jacketed metallic receptacle



Dec. 15, 1925- 1,566,221

F. L. LINDEMUTH VACUUM JACKETED METALLIC RECEPTACLE Fil d June 4, 1925 In ll ATTORN EYS I I Patented Dec. 15, 1925-,

" i .Q T TATES 4 1,566,221 PAI ENT' -OFFICE;

i RANcrs LLOYD rmnnuu'rmor BABYLON, NEw Yonx; A'ssIeNon TO NIAGARA ELEC- v raoLr'rIc moN come-ANY, me, A CORPORATION or NEW- YORK.

vAoucm zrAoxnrnn NErALLIc' REGEPTAGLE.

To all who met mag/concern:

- Be it known that I, FRAN IS LINDEM TH; a citizen of the United States, residin at Babylon, in the county of Suf- 5 folk, tatej of New' York, have invented certain new and useful Improvements in Vacuum-Jacketed' Metallic Receptacles; and I do hereby declare the following to 'be a full, clear, and exact description of the invention, such as will'enable others skilled in the artto whichit appertains tomake and use the same. A

This inventionrelates to receptacles for foods and like substances having double walls and having the space between the walls evacuated to minimize the transmission of heat to or from the interior of the receptacle.

v The invention is directed to the provithis character aving the two walls made of metal, whereby a receptacleis produced which can be made at a lower cost, which has a larger capacity for a given'size and which is safer to use.

Vacuum-jacketed rece have been made hereto ore with the'inner and outer walls formed of thin metal, the two walls having the form of bottles located onewithin the other -with..a space between them. The two walls are united, usually atthe'neck of thebottle, and. the/space be- V tween them is evacuated.

In .the manufacture ofbottles ofthis '7 character, it has been the practice to apply to the inner wall of the interior bottle a coating of a' vitreous enamel, this beingemployed because the acids in-f0odstuifs which might be placed in the container would be apt to attack the uncoated metalwith 'resultant deterioration of the purity of the foodstuff and slow corrosidn of the metal. Such coatings ofenamel', however, are not entirely reliable, for it frequently occurs 45 that there are pin-holes. or cracks in' the enamel such that the metal of the wall of v the container is bared and a substance placed within the receptacle may come intcontact with the metal. 1

I It has also become a common. practice to i apply aplatingof silver to the'exterior wall bf the inner bottle and the interior wall of the outer one so thatthe adjacentsurfaces of these two walls have a mirror finish which 5 greatly reduces the freedom of transmission sion of an improvement in receptacles ofwas; of this type of which the capacity Application filed June 4, 1925. Serial mam.

of heat, through the double wall to. or from .the interior of the'receptacle. --Such silver platings are effective but they add substantially to the'cost of the completed receptacle.

In accordance with the present invention, 69 a superior and less costly receptacle is made by applying a plating. of chromium to the" innerwa ll of the inner bottle in place of the enamel coating heretofore commonly employed and byapplying such a lating of chromium to the outer surface 0 the inner wall and to the inner surface of the outer wall in placeof the platingsoof silver heretofore applied -thereto. Such a chromium platin upon the inner surface of the inner 70 bottle 1n substitution for the enamel coatings; completely protects the metal wall to th'eextent of beingentirely-free from any imper :fections whatever such as pin holes and cracks which would e ose even a minute area of the metal of t e wall for contact with the substance which is placed within the receptacle. Therefore, the possibility-of acids in the substance contained within the receptacle attacking the metal of the inner bottle andthe'substance being deteriorated in-quality thereby, .is; entirely removed. Also, the chromiumplating upon the adjacent walls, of the two bottles, thatis, the walls of thevacuum acket, presents a bright mirror finislf which is as efl:'ective in preventing the transmission of heat waves through the double wall as the silver plating 1 heretofore employed. I Such a chromium lating can be applied to the walls of the loublefwall rec pt'acle I readily and at low cost in accordance with processes which are now known and avail able, with the result that the cost of manufacturing the receptacles in accordance with this invention, rather than in accordance with the practice heretofore followed, is sub stantiall reduced. Furthermore, the chromiuni p ating on they inner surface of the* inner bottle is of negligible-thickness as distinguished from the. appreciable thick-- ness'of the enamel coatings heretofore employed andconsidered essential, as a result of the receptacle is increased. v a 1 t Su h a chromium plating can bet-utilized in the manner above outlined whatever the metal employed in the two bottles which "formthe double walls of the receptacle. Usually these two bottles are made of' thin steel. I have' found that the best results are obtained when the two bottles forming the walls of the double walled receptacle are made of electrolytic iron on which the chromium plating is applied. Electrolytic iron may be worked to the appropriate shape readily and it possesses the requisite strength and it takes chromium plating very well and when so plated it presents a perfectly smooth nonattackable, non-poisonous metallic surface which stands the action of acids of all food products without the least attack for an indefinite time, in contradistinction to the enameled wall, with which lack of adhesion, scaling and cracking of the enamel and pin holes therein are of frequent occurrence and-as a consequence exposure of the metal of the wall to the acids of the substances placed within the receptacle.

A construction illustrating an' embodiment of the invention is illustrated in the accompanying drawings in which Fig. 1 is a longitudinalsection of a vacuum-jacketed metallic receptacle and Fig. 2 is a" sectional detail view on line 22 of Fig.

In these drawings, 3 indicates the inner wall .of the double Walled receptacle and L the outer wall, these being in the form of bottles mounted one within the other and connected at their upper ends 5 toform a closed space 6 between them which is completely exhausted of air. The receptacle so formed may be mounted within a casing 7 with suitable yielding spacers 8 interposed and a top 9 may be provided fitting upon the casing and extending vover a cork 10.

The inner sin-face of the inner wall 3 is provided with a plating of chromium indicated at 11. Also, the outer surface of this inner wall 3 and the inner surface of the outer wall 4.- are provided with platings of chromium 12. lhese platings 12pmvide upon the adjacent surfaces of the two walls of the receptacle a bright mirror finish which aids greatly in preventing the transmission of heat through the wall to and from the interior of the receptacle. Also,

.the plating 11 on the inner surface of the inner wall presents a smooth, sanitary surface which completely covers the wall, preyenting quite fully the contact of any substance placed within the receptacle with the metal from which the wall is made and therefore making that wall impervious to attack by acids contained in" any such substance. I a

As above stated, the walls 3 and 4 may be made of any base metal, as for instance, thin steel as has heretofore been commonly employed, but the best results are attained when these walls are made of electrolytic iron.

I claim:

'1. A vacuum-jacketed metallic receptacle having inner and outer metallic walls joined together to provide a space between themwhich is evacuated, the inner surface of the inner wall being plated with chromium to provide thereon a smooth, sanitary coating fully protecting the metal from which the wall is made against attack of a substance contained within the receptacle.

2. A vacuum-jacketed metallic receptacle having inner and outer metallic walls joined together to provide a space between them which is evacuated, the inner and outer surfaces of the inner wall and the inner surface of the outer wall beingprovided with a plating of chromium.

3. A vacuum-jacketed metallic receptacle having inner and outer walls made of electrolytic iron and joined together to provide a space between them which is evacuated, the inner and outer surfaces of the inner wall and the inner surface of the outer wall being provided with a plating of chromium.

' In testimony whereof I afiix my signature. 

